1. Can You Upgrade To High Sierra From Mountain Lion
2. Upgrade Path From Lion To High Sierra
3. Upgrade To High Sierra From Lion 10.7.5
4. Upgrade From Mountain Lion To High Sierra

Sierra - OS 10.12 High Sierra - OS 10.13 Third, you need to be concerned about any third party software you are using, and most likely, will need either to upgrade some/most/all of them to be compatible with the OS you want to move to, or possibly some of them might not work at all. Long-term Mac users can guess that macOS High Sierra (10.13) is a refinement of macOS Sierra (10.12) because of the naming structure. Just as Mac OS X 'Snow Leopard' (10.6) was a refinement of Mac OS X Leopard (10.5) and OS X Mountain Lion (10.8) was a refinement of OS X Lion (10.7), rather than offering radical new features, macOS High Sierra. MultiBeast, the ultimate post-installation utility, has been updated to version 10.4.0 for macOS High Sierra 10.13.6. MultiBeast is an all-in-one post-installation utility designed to enable boot from a hard drive. It also features a collection.

Upgrade to macOS Big Sur

Before installing this upgrade, make sure that your Mac is ready.

Check compatibility

macOS Big Sur supports most Mac models introduced in 2013 and later.

View compatible Mac models

Make a backup

Before you upgrade, make a complete backup with Time Machine, or store your files in iCloud.

Learn how to back up your Mac

Free up space

If the installer needs more storage space to upgrade, you can free up space using tools that come with your Mac.

Free up storage space

Download macOS Big Sur

If you’re using macOS Mojave or later, choose Apple menu  > System Preferences, then click Software Update. If you’re using an earlier macOS, use the App Store instead.

Learn how to download and install macOS Big SurGo to the App Store

Get to know macOS Big Sur

Learn about some of the new features of macOS Big Sur.

Control Center

Control Center brings favorite controls such as Bluetooth, Wi-Fi, Do Not Disturb, and Sound together in a single place—so you can easily adjust them at any time.

Use Control Center

Notification Center

Notification Center puts notifications and>

Safari

Customize your start page, navigate with ease using the new tab bar, and access a new privacy report to see just how Safari protects your privacy as you browse.

Get to know Safari

Maps

Discover great places around the world and navigate easier with guides, cycling directions, indoor maps, Look Around, electric vehicle routing, and more.

Messages

Send messages to friends and family using new tools that make it easier to keep track of group conversations and give you fun, engaging ways to express yourself.

Use MessagesLearn more on YouTube

Photos

Use the expanded editing capabilities in Photos to easily make simple changes and more advanced adjustments to your photos.

Learn how to edit your photos

Have a question?

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Get support

To get the latest features and maintain the security, stability, compatibility, and performance of your Mac, it's important to keep your software up to date. Apple recommends that you always use the latest macOS that is compatible with your Mac.

Learn how to upgrade to macOS Big Sur, the latest version of macOS.

Check compatibility

If a macOS installer can't be used on your Mac, the installer will let you know. For example, it might say that it's too old to be opened on this version of macOS, or that your Mac doesn't have enough free storage space for the installation.

To confirm compatibility before downloading, check the minimum requirements for macOS Catalina, Mojave, High Sierra, Sierra, El Capitan, or Yosemite. You can also find compatibility information on the product-ID page for MacBook Pro, MacBook Air, MacBook, iMac, Mac mini, or Mac Pro.

Make a backup

Before installing, it’s a good idea to back up your Mac. Time Machine makes it simple, and other backup methods are also available. Learn how to back up your Mac.

Download macOS

It takes time to download and install macOS, so make sure that you're plugged into AC power and have a reliable internet connection.

Can You Upgrade To High Sierra From Mountain Lion

Safari uses these links to find the old installers in the App Store. After downloading from the App Store, the installer opens automatically.

• macOS Catalina 10.15 can upgrade Mojave, High Sierra, Sierra, El Capitan, Yosemite, Mavericks
• macOS Mojave 10.14 can upgrade High Sierra, Sierra, El Capitan, Yosemite, Mavericks, Mountain Lion
• macOS High Sierra 10.13 can upgrade Sierra, El Capitan, Yosemite, Mavericks, Mountain Lion

Safari downloads the following older installers as a disk image named InstallOS.dmg or InstallMacOSX.dmg. Open the disk image, then open the .pkg installer inside the disk image. It installs an app named Install [Version Name]. Open that app from your Applications folder to begin installing the operating system.

• macOS Sierra 10.12 can upgrade El Capitan, Yosemite, Mavericks, Mountain Lion, or Lion
• OS X El Capitan 10.11 can upgrade Yosemite, Mavericks, Mountain Lion, Lion, or Snow Leopard
• OS X Yosemite 10.10can upgrade Mavericks, Mountain Lion, Lion, or Snow Leopard

Install macOS

Follow the onscreen instructions in the installer. It might be easiest to begin installation in the evening so that it can complete overnight, if needed.

Upgrade Path From Lion To High Sierra

If the installer asks for permission to install a helper tool, enter the administrator name and password that you use to log in to your Mac, then click Add Helper.

Upgrade To High Sierra From Lion 10.7.5

Please allow installation to complete without putting your Mac to sleep or closing its lid. Your Mac might restart, show a progress bar, or show a blank screen several times as it installs macOS and related firmware updates.

Learn more

Upgrade From Mountain Lion To High Sierra

You might also be able to use macOS Recovery to reinstall the macOS you're using now, upgrade to the latest compatible macOS, or install the macOS that came with your Mac.